Help with define_insn and constraints

[Ian Lance Taylor]

Richard Henderson <rth@redhat.com> writes:

> On Thu, Dec 23, 2004 at 04:37:40PM -0500, Ian Lance Taylor wrote:
> > >  ?? In your first post, you said you had 19 hard regs.  Does this not imply
> > > you're trying to keep your frame pointer in a pseudo ??
> > 
> > In gcc, it's normal for the frame pointer to be a pseudo which is
> > eliminated to the stack pointer, or, in the case of a function which
> > calls alloca, to be eliminated to some hard register which serves as
> > the so-called hard frame pointer.  See FRAME_POINTER_REGNUM and
> > HARD_FRAME_POINTER_REGNUM.
> 
> No.  The frame pointer is *never* a pseudo.  Sometimes a fake
> hard register, but never a pseudo.

Right, sorry.  I did mean to say a fake register.

Ian